The productive interdisciplinary exchange with legal anthropology and the “law and society” paradigm has significantly contributed to the formation of the “legal turn” in historical studies of empires. This “turn” has intensified the study of legal pluralism, the competition and mutual influence among various types of imperial jurisdictions (state, corporate, confessional, ethnic, estate-based, regional, communal, etc.), and the significance of law and judicial institutions in managing diversity and integrating imperial spaces. Additionally, it explores the role of judicial and legal institutions in reinforcing the status and identity of imperial communities and in shaping their interactions with the state. This article, in light of the new interdisciplinary synthesis, discusses one of the oldest and most enduring concepts in the legal-historical sphere of the Russian Empire — the model of “legal dualism”. Formed in the 19th century, this concept remains influential in historiography. It posits the coexistence and sharp distinction between two legal realms: on one hand, a unified realm of modern statutory law and corresponding institutions that regulate the lives of the empire's elite; and on the other hand, an ethnically and locally variable realm of particularistic “customary law” and associated conflict resolution practices prevalent among the heterogeneous population of the imperial center and periphery. According to this concept, the establishment of new courts modeled on European systems during the post-reform period exacerbated the legal and behavioral divide, disrupting pre-existing elements of pre-reform particularistic inclusion of ethnic and class communities. However, recent research has critiqued and revised the “legal dualism” concept in both the pre-reform and post-reform periods. Analyzing this historiographical dynamic has enabled the identification of the most promising avenues for further research on the legal-historical aspects of Russia from the 18th to the early 20th centuries, developing a more realistic depiction of the interaction between the state and various local, regional, class-based, ethnic, and confessional communities within the empire.